Chuck Assembly

ABSTRACT

A chuck assembly configured to provide a shorter longitudinal profile. The chuck assembly includes a chuck body with a support bearing mounted to a rear portion of the chuck body and mounted to a portion of a housing such that a cavity is defined axially rearward of the support bearing and is configured to receive the jaws when the rear portion of the jaws extend axially rearward.

FIELD OF THE INVENTION

The present invention relates to a drill and, in particular a drillhaving a compact chuck assembly.

BACKGROUND OF THE INVENTION

Typically, a drill has a chuck assembly that includes jaws that aredisplaced in passages between axially front and radially closely spacedpositions and axially back and radially widely spaced positions. Toaccommodate the axial travel of the jaws, it has been known to make thechuck fairly long, which may make the drill harder to handle, while notcontributing to the overall functionality of the drill.

The present invention provides a chuck assembly that allows the drilland the chuck assembly to be shorter than conventional drills and chuckassemblies.

SUMMARY OF THE INVENTION

The present invention includes a tool with a chuck assembly thatincludes a chuck body having an axial forward end and an axial rearwardend, a thrust ledge extending radially outward from the chuck body; anda support bearing having an inner periphery mounted to the chuck bodyand having an outer periphery mounted to a housing of the tool, whereinjaws extending axially rearward can extend into a cavity defined withinthe housing and located axially rearward of the support bearing. Incertain aspects of the invention, the tool can include a clutchmechanism. In other aspects of the invention, the tool can include aspindle lock mechanism that, when actuated, prevents the chuck body fromrotating with respect to the housing. In other aspects of the presentinvention, the tool claim can include a clutch override mechanism thatis operable in any setting of the clutch mechanism.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side perspective view of one embodiment of a drill thatincorporates a chuck assembly according to the present invention.

FIG. 2 is a cross sectional view of another embodiment of a drill (acorded drill) that illustrates a chuck assembly according to the presentinvention.

FIG. 3 is a cross sectional view of the drill of FIG. 2 along line A-A.

FIG. 4 is a side view of a chuck body according to one embodiment of thepresent invention.

FIG. 5 is a side view of the chuck body of FIG. 4 with a bearing locatedaxially rearward of the nut on the chuck body.

FIG. 6 is a side perspective view of the chuck body of FIG. 5 with aportion of the bearing being cutaway.

FIG. 7 is a detail view of the drill of FIG. 2.

FIG. 8 shows a partially cut away view of a right angle drill thatincorporates the chuck assembly of the present invention.

FIG. 9 is a sectional view of the right angle drill of FIG. 8.

FIG. 10 is a cross sectional view of a chuck assembly according to thepresent invention where the chuck body has a monolithic tail functioningas the main drive shaft in a right angle drill.

FIG. 11 is a cross sectional view of a chuck assembly according to thepresent invention where the chuck body has a monolithic tail functioningas the main drive shaft in a drill.

FIG. 12 is a side view of a chuck assembly that incorporates a clutchmechanism and clutch bypass feature.

FIG. 13 is a cross sectional view of the chuck assembly of FIG. 12.

FIG. 13 a shows a partial view of a torque adjustment ring shown in theassembly of FIG. 13.

FIG. 13 b is a partial view of a torque bypass mechanism shown in theassembly of FIG. 13.

FIG. 14 is a cross sectional view of another embodiment of a chuckassembly according to the present invention where a planetary gear setis incorporated with the chuck body.

FIG. 14 a shows a detail view of the spindle lock.

FIG. 15 is an exploded view of chuck assembly, clutch mechanism and gearassembly of FIG. 14.

FIG. 15 a is a partial view of the torque bypass mechanism shown in FIG.15.

FIG. 16 is a view of a chuck body useful with one aspect of the chuckassembly of FIG. 14.

FIG. 17 is a side perspective view of a tool incorporating the chuckassembly of the present invention and which also has an auto spindlelock and torque adjustment mechanism.

FIG. 18 is a cross section view the tool of FIG. 17.

FIG. 19 is an exploded view of the chuck assembly of FIG. 18 from oneperspective.

FIG. 20 is an exploded view of the chuck assembly of FIG. 18 fromanother perspective.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Turning now to FIG. 1, a tool 10 utilizing the chuck assembly 70according to the present invention is shown. The tool 10 has a housing20 generally formed in two parts 22, 24 that are joined to each to forman enclosure for the several parts of the tool 10. The tool 10 shown inFIG. 1 is a hand held drill and is powered by an electrical cord (notshown). One of skill in the art will understand that the chuck assembly70 of the present invention can be used with a number of different toolsbut for ease of description, it will be described in connection with adrill. For example, the tool could be a screwdriver, a grinder, or arouter, etc. The tool 10 is typically driven by a motor 30 that ispowered from an electrical source that can include a hard wire,batteries, or both. Such tools and motors are conventional and thereforea further discussion is not warranted or necessary.

FIG. 2 shows a cross sectional view of the tool 10 of FIG. 1. It isunderstood that the half of the housing not shown 22 will mate with thehalf 24 that is shown. The drill includes a motor 30 with an outputshaft 32 that carries an output shaft gear 33 at a distal end of theoutput shaft 32. The output shaft 32 is rotatably supported by a gearingsupport 36. The output shaft 32 drives a first gear 53 via a pinion. Thefirst gear 53 and the second gear 34 are fixed on the first shaft 41.The second gear 34 drives the spindle 40 via spindle driving gear 64.The spindle 40 has a first end 42 that is rotatably supported by ajournal 46. The first end 42 is attached to a chuck body 74.Alternatively, the spindle 40 may be monolithic with the chuck body 74.The other, opposite second end 44, is supported by the gearing support36. A spindle lock gear 52 is non-rotatably provided on the spindle 40near the second end 44. The spindle lock gear 52 can be selectivelyengaged by a spindle lock mechanism 50, as best seen in FIG. 3. In thisregard, the gearing support 36 is fixed within the tool housing 20. Thetool housing 20 carries a spindle lock mechanism 50 that includes aguide 54 for a lock shaft 56. A head 58 of the lock shaft 56 extendsfrom the guide 54 and the tool housing 20 so that it is accessible tothe user. The other, opposite end, is provided with teeth 60 or otherfeatures to engage the spindle lock gear 52. A biasing mechanism 62,generally in the form of a spring, is disposed between the head 58 ofthe lock shaft and the guide 54 to bias the lock shaft 59 outward or ina non-locking position. To selectively lock the spindle 40 fromrotating, the head 58 of the lock shaft is depressed or moved toward thetool housing 20 until the opposite end 60 contacts or engages thespindle lock gear 52. When the spindle 40 is locked, the chuck outersleeve 90 can be rotated to loosen or tighten the jaws 82 of the chuck.

A spindle driving gear 64 is fixedly provided on the spindle 40 betweenthe first end 42 and the second end 44 of the spindle 40. In general,the spindle driving gear 64 may be provided axially forward of thespindle lock gear 52. The output shaft 32 drives the first gear 53 viapinion 33 so to that the second gear 34 drives the spindle 40 via thespindle driving gear 64. The spindle driving gear 64 engages the outputshaft gear 34. When the spindle lock mechanism 50 is not engaged,rotation of the output shaft gear 34 (such as when the motor 30 causesthe output shaft 32 to rotate) causes the spindle 40 to rotate. Thespindle 40 is sized such that it does not extend axially forward of thehousing 20. In other words, the spindle 40 has an axial length such thatthe first end of the spindle 42 does not extend axially forward of thehousing 20.

As noted above, the first end of the spindle 42 is connected to thechuck body 74. Turning now to FIG. 4, one embodiment of the chuck body74 useful in the chuck assembly 70 of the present invention is shown.The chuck assembly 70 defines a longitudinal axis 72 along which thechuck body 74 has an axial forward end 76 and axial rear end 78. Theaxial forward end 76 has an axial opening through which jaws 82 that arecapable of gripping the shaft of a work tool extend. The jaws 82 aremounted within bores 84 angularly positioned through the body 74 andequally spaced throughout the body 74. An adjustment ring or nut 88 ismounted within a groove in the body 74 and it includes threads thatengage corresponding threads on the jaws. As a result, when theadjustment ring or nut 88 rotates with respect to the body 74, the jaws82 move in a corresponding axially forward or rearward direction.

An outer sleeve 90 is rotatably mounted about the body 74 and is axiallyfixed with respect to the body 74. As seen in FIG. 2, the outer sleeve90 may be axially fixed by a ring 92 that is axially fixed to the chuckbody 74 yet allows the outer sleeve 90 to rotate with respect to thebody 74. The outer sleeve 90 extends axially rearward toward the toolhousing 20. In one aspect, the outer sleeve does not extend axiallyrearward beyond the support bearing 96.

The outer sleeve 90 is operatively connected with the adjustment ring ornut 88 so that rotation of the outer sleeve 90 causes a correspondingrotation of the adjustment ring or nut 88 in the same direction as therotation of the outer sleeve 90. The outer sleeve 90 may be operativelyconnected in a variety of known means so long as rotation of the outersleeve 90 causes rotation of the adjustment ring or nut 88. For example,the outer sleeve 90 may be connected to a nut sleeve 94, which in turn,is connected to the nut 88 so that as the outer sleeve 90 is rotatedwith respect to the body 74, the nut 88 will likewise be rotated.

The chuck body 74 has a support ledge 86 that extends radially from thebody 74. The nut 88 is located axially forward of the support ledge 86.Axially rearward of the ledge 86, a support bearing structure 96 ispress fit onto the chuck body 74 as shown in FIGS. 5 and 6. The supportbearing structure 96 is axially fixed within the housing 20 so thatchuck body 74 is axially fixed but rotatable. A cavity or annular space100 is defined between the support bearing structure 96 on the chuckbody 74 and the journal 46 for the spindle 40. The annular space 100 issized to accommodate the jaws 82 when they are in an axially rearwardposition. The annular space 100 allows the axial length of the chuckbody 74 to be reduced. As a result, the overall length of the drill canbe shorter. In addition, the length of the spindle 40 can be reduced,which may reduce any bending or vibration. It is also likely that drillchuck runout may be prevented or minimized. As illustrated in FIG. 7,the distance between the axially forward support for the chuck to theload (i.e., the axial forward end of the workpiece) is indicated as X.The distance between the axially rearward support for the spindle (or inthe case of a monolithic tail of the chuck body) and the load (i.e., theaxial forward end of the workpiece) is indicated as Y. Desirably, theratio of X to Y should be as small as possible to minimize runout. Incertain embodiments, the ratio is 0.5 or less.

As noted above, the chuck assembly 70 may be used with tools other thana drill. Accordingly, FIG. 8 shows a right angle drill 200 thatincorporates the features of the chuck assembly 70 described above. Inparticular, the chuck body 74 has a support bearing 96 a portion ofwhich is fixed to the body 74 and another portion of which is axiallyfixed to the housing 202 so that the chuck body 74 can rotate withrespect to the housing 202.

As shown in FIG. 10, the spindle 220 is oriented perpendicular to amotor 210 that drives an output gear 212 through a planetary gear set(not shown) located within a planetary gear housing 213. One end of thespindle 222 is rotatably supported by a journal 230 and the other end224 is connected to the chuck body 74. A spindle drive gear 226 isdisposed between the two ends 222, 224 of the spindle 220 and engaged bythe output gear 212. As a result, when the output gear 212 rotates (suchas from rotation caused by the motor 210), the chuck body 74 rotates.The spindle gear 226 is spaced from the support bearing 96 to define acavity 240 into which the jaws 82 may extend, when the jaws 82 are in anaxially rearward position.

Because only a single sleeve is provided, the right angle drill 200described above, may have a spindle lock mechanism 250. FIG. 9 shows oneembodiment of a spindle lock mechanism 250 useful with the chuckassembly 70 of the embodiment of FIG. 8. The spindle lock mechanism 250includes an actuator 252 that is slidable in a direction perpendicularto a longitudinal axis 72 of the chuck assembly 70. In particular, theactuator 252 includes a first end 254 and a second end 256. The secondend of the actuator 256 includes a boss 258 that receives a portion of abiasing mechanism 260 (illustrated as a spring) that will bias theactuator 252 in a non-locking position. In particular, the boss 258engages a first end 262 of the biasing mechanism 260 and the second end256 engages a lock shaft 266. In particular, the lock shaft 266 has afirst end 268 that is selectively engaged by the first end 254 of theactuator 252 and a second end 270 that engages a portion of the spindle220. In this regard, the second end 270 of the lock shaft 266 may beprovided with teeth 272 that can engage a spindle lock gear 232 providedon the spindle 220. As shown in FIG. 8, the spindle lock gear 232 may bedisposed on the spindle 220 between the spindle drive gear 226 and thejournal 230. A biasing member 274, shown as a spring in FIG. 9, has oneend 276 that contacts a stationary support rib 290 that is part of theright angle gearbox and another end that 278 contacts a portion of thelock shaft 266, in particular a portion of the lock shaft 266 near thefirst end 268. The biasing member 274 biases the second end 270 of thelock shaft 266 out of engagement with the spindle lock gear 232. Whilethe above spindle lock mechanism 250 described above is suitable, it isto be understood that the spindle lock mechanism can be configured in avariety of different ways and, thus, the spindle lock mechanismdescribed with respect to FIGS. 2 and 3 may be used, as well as otherspindle lock mechanisms.

As noted above, the spindle 40, 220 shown in the chuck assembly of FIGS.2 and 10 and described in connection with FIGS. 1-10 could be replacedby making the spindle 40, 220 monolithic with the tail 80 of the chuckbody 74. An example of this arrangement is shown in FIGS. 10-11. There,the chuck body 74 includes a tail 80 axially rearward of the 96 supportbearing and extending from the chuck body 74. The tail 80 may functionas the spindle 40, 220 described above in all respects except that thetail 80 is monolithic with the chuck body 74.

Turning now to FIGS. 12 and 13, another embodiment of the chuck assemblyis illustrated. In this embodiment, the chuck assembly 360 is associatedwith a torque adjustment mechanism 400. Referring specifically to FIG.13, a motor 300 is shown connected to gearing 312 located within agearbox housing 310. The gearing 312 receives the motor output shaft 304and through a motor output gear 306 and the gearing 312, causes thechuck body 364 to rotate. A torque adjustment mechanism 400 is providedbetween the motor 300 and the outer sleeve 380 of the chuck assembly360. It is believed that the chuck assembly 360 according to the presentinvention will work with a variety of gearbox arrangements and torqueadjustment mechanisms 400. For instance, it is believed that the chuckassembly 360 can be associated with a clutch assembly such as thatdescribed in US 2006/0213675, the contents of which are incorporatedherein by reference.

In addition, the chuck assembly 360 of this embodiment is shown with anautomatic spindle lock mechanism 340. In this regard, it is believedthat the spindle lock mechanism described in U.S. Pat. No. 6,702,090,which is incorporated herein by reference, could be used with the chuckassembly 360 according to the present invention.

Turning back to FIG. 13, the chuck assembly 360 includes a chuck body364 with an axial forward end 366 with an axial opening through whichjaws 372 that are capable of gripping the shaft of a work tool extend.The jaws 372 are mounted within bores 374 angularly positioned throughthe body 364 and equally spaced throughout the body 364. An adjustmentring or nut 378 is mounted within a groove in the body 364 and itincludes threads that engage corresponding threads on the jaws 372. As aresult, when the adjustment ring or nut 378 rotates with respect to thebody 364 the jaws 372 move in a corresponding axially forward orrearward direction. An outer sleeve 380 is rotatably mounted about thebody 364 and is axially fixed with respect to the body 364. The outersleeve 380 may be axially fixed by a ring 388 that is axially fixed tothe chuck body 364 yet allows the outer sleeve 380 to rotate withrespect to the body 364.

The outer sleeve 380 is operatively connected with the adjustment ringor nut 378 so that rotation of the outer sleeve 380 causes acorresponding rotation of the adjustment ring or nut 378 in the samedirection as the rotation of the outer sleeve 380. The outer sleeve 380may be operatively connected in a variety of known means so long asrotation of the outer sleeve 380 causes rotation of the adjustment ringor nut 378. For example, the outer sleeve 380 may be connected through anut sleeve 384 engaged by the outer sleeve 380 and fixed to the nut 378.

As noted above, a motor 300 includes an output shaft 304 defining amotor axis 302. The output shaft 304 includes an output gear 306 thatrotates with the output shaft 304. The output gear 306 functions as asun gear and is connected to a first layer of planet gears 314 thatrotate about a first ring 316. The first layer of planet gears 314 arerotatably carried or supported on axial projections 320 on one side of aplanet carrier 318 that has an output gear 322 acting as a second layersun gear on its opposite side. The second layer sun gear 322 engages asecond layer of planet gears 324 that are rotatable about a second layerring gear 326 that is supported within the gearbox housing 310. Thesecond layer planet gears 324 are rotatably carried by, in thisinstance, a spindle lock carrier 342 of a spindle lock mechanism 340. Asuitable spindle lock mechanism is shown and described in U.S. Pat. No.6,702,090, the contents of which are incorporated herein by reference.

The spindle 330 has a first end 332 and a second end 334. The second end334 is operatively connected to the rear end or tail 374 of the chuckbody 364. As with the other embodiments of the chuck body 364 describedabove, the chuck body of this embodiment has a support bearing structure386 press fit onto the rear end 368 of the chuck body 364. The supportbearing structure 386 is axially fixed within the gearbox and clutchmechanism housing 310 so that chuck body 364 is axially fixed butrotatably supported. In particular, in this embodiment, a support ring388 may be fixed to a portion of a thrust ledge 376 and/or a portion ofthe tail 370 of the chuck body 364. The support ring 388 may then befixed to the support bearing structure 386 so that the chuck body 364can rotate with respect to the gearbox and clutch mechanism housing 310.Alternatively, the support ring 388 and chuck body 364 may be integralto provide a single component structure.

An annular space 390 is defined between the support bearing structure386 on the chuck body 364 and the spindle lock mechanism 340. Theannular space 390 is sized to allow the jaws 372 to extend when the jaws372 are in an axially rearward position. The annular space 390 allowsthe axial length of the chuck body 364 to be reduced. As a result, theoverall length of the drill can be shorter.

As noted above, this embodiment includes a torque adjustment mechanism400. The torque adjustment mechanism 400 includes an outer torqueadjustment sleeve 402 axially fixed but rotatably mounted about thegearbox and torque adjustment mechanism housing 310. Rotation of theouter torque adjustment sleeve 402 in a selected direction increases ordecreases the torque limit.

A torque adjustment ring 406 is connected to an inner portion of theouter torque adjustment sleeve 402 such that rotation of the outertorque adjustment sleeve 402 causes rotation of the torque adjustmentring 406. The torque adjustment ring 406 is better shown in FIG. 13 a.The torque adjustment ring 406 is operatively engaged with a contactingmember 410 that contacts a clutch face 432, as explained in more detailbelow. In particular, the torque adjustment ring 406 includes steps 408that engage the contacting member 410. The contacting member 410includes a carrier member 412 that extends axially rearward and isoperatively and biasingly connected to a follower member 424, one end ofwhich engages a clutch 430. It can be seen that as the torque adjustmentring 406 is rotated, the carrier member moves from one step to anadjacent step and, depending on the direction of rotation, the carriermember moves in an axially rearward or axially forward direction. Thecarrier member 412 may be in the form of a pin that has a first end 414carried by or engaged with the torque adjustment ring 406 and a secondend 416 that engages one end 420 of a biasing member 418, shown in FIG.13 as a coil spring. The other end 422 of the biasing member 418 isconnected to one end 426 of the follower member 424. The other end 428of the follower member 424 engages a clutch face 432 provided on aclutch 430, which is connected to the first ring gear 316. The clutch430 may be formed as a ring secured to the first ring gear 316 or may beformed as part of the first ring gear 316.

The clutch face 432 in engagement with the other end 428 of the followermember 424 is configured so that resistance to rotation of the firstring gear 316 can be changed upon selective rotation of the outer torqueadjustment sleeve 402.

In one embodiment, the clutch face 432 may be ramped or may have severalramps such as in a sinusoidal pattern. Accordingly, as the outer torqueadjustment sleeve 402 is rotated to a higher (greater) torque setting,the carrier member 412 is moved in an axially rearward direction causingthe biasing member 418 to increase or create more pressure or force onthe follower member 424, which is in contact with the clutch face 432and, in turn, increases the resistance to rotation of the clutch 430 andfirst ring gear 316.

A torque bypass mechanism 440 may also be provided. One example of asuitable torque bypass mechanism 440 is shown in FIG. 15 a. The torquebypass mechanism 440 will operate regardless of the torque setting. Thetorque bypass mechanism 440 includes an actuator 442 extending from thegearbox housing 310. The actuator 442 as shown in FIG. 13 has an innersurface 444 that engages a carrier member 446 that extends axiallyrearward to engage the clutch face 432. The actuator 442 may beconfigured such that as the actuator 442 is moved, the carrier member446 is moved in an axially rearward direction to contact the clutch face432 to prevent the clutch 430 and thus the fist ring 316 from rotating.As a result, the motor 300 will drive the spindle 330 and thus the chuckbody 364 for sustained rotation without any torque limitation.

As best seen in FIG. 13 b, the inner surface 444 of the actuator 442 maybe provided with a first step 443 and a second step 445 so that when theactuator is in a first position, a first end 448 of the carrier member446 is engaged by the first step 443 and the second end 450 of thecarrier member is not in engagement with the clutch face 430. When theactuator is rotated to a second position, the first end 448 of thecarrier 446 is engaged by the second step 445 and the second end 450 ofthe carrier member engages the clutch face 432 to block rotation of theclutch 430.

A biasing member 452 may be provided to assist in returning the carriermember 446 into a position where the end 448 is in contact with thefirst step 443. As shown in FIG. 13 b, the biasing member 452 is shownas a coil spring that is wrapped around the carrier member 446.

In another aspect of the invention, the auto spindle lock mechanism 340described above is replaced with a manual spindle lock mechanism, theoutput carriers have been moved and integrated with the chuck body, andthe torque adjustment assembly has been moved to the rear of the drillhousing. Turning now to FIGS. 14 and 15, in this aspect, the toolhousing 20 defines a cavity for a motor 500 from which an output shaft504 that carries an output gear 506 extends in an axial forwarddirection. A support 560 fixed to the housing is provided with a centralaperture 562 from which the motor output shaft 504 extends.

The tool housing 20 has a rear end 21 from which a torque adjustmentsleeve 632 is axially fixed but rotatably mounted. An inner surface ofthe torque adjustment sleeve 632 carries a first end 644 of a carriermember 642 such that, as the torque adjustment sleeve 632 is rotated ina torque increasing direction, the carrier member 642 is moved in anaxially forward direction. In one aspect, the inner surface of thetorque adjustment 632 sleeve is ramped. In another aspect, a torqueadjustment ring is connected to an inner portion of the torqueadjustment sleeve such that rotation of the torque adjustment sleevecauses rotation of the torque adjustment ring. In this instance, thetorque adjustment ring has a structure such that as it is rotated in onedirection, the carrier member 642 is moved axially forward and when itis rotated in another direction, the carrier member 642 is moved axiallyrearward.

The second end 646 of the carrier member 642 is operatively andbiasingly connected to a follower member 654, one end 658 of whichengages a clutch face 662. In particular, the carrier member 642 has afirst end 644 operatively associated with the torque adjustment sleeve632 and a second end 646 that engages one end 650 of a biasing member648, shown in FIG. 15 as a coil spring. The other end 652 of the biasingmember 648 is connected to one end 656 of the follower member 654. Thefollower member 654 extends through a pin hole 564 in the support 560and the other end 658 of the follower member 654 engages a clutch face662 on a clutch 660 that is connected to the first ring gear 516. In oneaspect, the clutch face 662 may be monolithic with the first ring gear516.

The clutch face 662 is configured so that resistance to rotation of thefirst ring gear 516 can be changed upon selective rotation of the torqueadjustment sleeve 632. In one embodiment, the clutch face 662 may beramped or may have several ramps such as in a sinusoidal pattern.Accordingly, as the torque adjustment sleeve 632 is rotated to a higher(greater) torque setting, the carrier member 642 is moved in an axiallyforward direction causing the biasing member 648 to increase pressure orforce on the follower member 654, which is in contact with the clutchface 662 and, in turn, increases the resistance to rotation of the firstring gear 516.

The motor output shaft 504 includes a gear 506 which acts as a sun gearthat is connected to a first layer of planet gears 514 that rotate aboutthe first ring 516, described above. The first layer of planet gears 514are rotatably carried or supported on axial projections 520 on one sideof a planet carrier 518. The opposite side of the carrier 518 has anoutput gear 522 acting as a second layer sun gear. The second layer sungear 522 engages a layer of planet gears 524 that are carried by thechuck body 574 as described below and that are rotatable about a secondlayer ring gear 526 that is fixed within the gearbox housing 510.

As better seen in FIG. 16, the chuck body 574 has a front end 576 and arear end 578. The chuck body 574 has an axial forward end 576 with anaxial opening through which jaws 584 that are capable of gripping theshaft of a work tool extend. The jaws 584 are mounted within bores 586angularly positioned through the body 574 and equally spaced throughoutthe body. An adjustment ring or nut 590 is mounted within a groove inthe body 574 and it includes threads that engage corresponding threadson the jaws 584. As a result, when the adjustment ring or nut 590rotates with respect to the body 574 the jaws 584 move in acorresponding axially forward or rearward direction. An outer sleeve 610is rotatably mounted about the body 574 and is axially fixed withrespect to the body 574. The outer sleeve 610 is connected to theadjustment ring or nut 590 so that when the outer sleeve 610 is rotated,the adjustment ring or nut 590 is rotated. As with the other embodimentsdescribed above, the chuck body has a ledge 588 and the support bearing616 is fixed to the rear portion of the ledge.

One or more and desirably three pins 592 extend axially rearward fromthe ledge 588 and respectively carry a second planet gear 524. A tail580 extends from the ledge 588 and it includes an opening 582 in which aportion of the one or more planet gears 524 can extend. Although FIG. 16shows a single opening 582, it will be understood that, in thisinstance, three openings 582 are present to receive a portion of theeach of the three planet gears 524. As noted above, the three planetgears 524 are driven by the second layer sun gear 522 and rotate aboutthe second ring gear 526.

Turning back to FIG. 15, a bushing 600 has an outer periphery 602 thatis fixed to the inner portion of the gearbox housing 510 and has aninner periphery that surrounds the tail 580 of the chuck body 574 toallow the chuck body 574 to rotate. A C-ring or suitable securing member604 is provided on the tail 580 of the chuck body 574 to restrain thechuck assembly 570 from forward axial movement.

A torque bypass mechanism 670 may be provided. The torque bypassmechanism 670 will operate regardless of the torque setting. The torquebypass mechanism 670 includes an actuator 672 extending from thehousing.

The actuator 672 is best seen in FIG. 15 a has an outer surface thatextends from the housing and is engageable by the user. The innerportion 674 of the actuator is operatively connected with a carriermember 676 that extends axially forward and is operatively and biasinglyconnected to a follower member 688, one end 692 of which engages theclutch face 662. In particular, the carrier member 676 has a first end678 operatively connected to the torque bypass actuator 672 and a secondend 680 that engages one end 684 of a biasing member 682, shown in FIG.15 as a coil spring. The other end 686 of the biasing member 682 isconnected to one end 690 of the follower member 688. The other end 692of the follower member 688 engages the clutch face 662, which isconnected to the first ring gear 516. As the clutch bypass actuator 672is moved or rotated, the force exerted by carrier member 676 and thusthe follower member 688 on the clutch face 662, hinders rotation of thefist ring 516. As a result, the motor 500 will drive the output gear 522and thus the chuck body 574 for sustained rotation without any torquelimitation.

As noted previously, the chuck assembly 570 can be provided with aspindle lock mechanism 540. FIG. 14 a shows a detail view of oneembodiment of a spindle lock mechanism 540 useful in the presentinvention. The spindle lock mechanism 540 includes an actuator 542accessible through the gearbox housing 510 and having at least one anddesirably two legs extending into the housing. A biasing member 548engages at least a portion of the actuator 542 to bias the actuator outof locking engagement with gearing provided on the peripheral surface ofthe first layer planet carrier 518. As shown in FIG. 14 a, the biasingmember 548 includes a spring having one end 550 engaged with a leg 546of the actuator and the other end 552 engaged with a portion of thegearbox housing 510. The inner portion of the actuator 542 has a pin orteeth 544 that can engage the gearing provided on the peripheral surfaceof the first layer planet carrier 518 to prevent the sun gear and thusthe chuck body 574 from rotating.

Turning now to FIGS. 17-20 another aspect of the present invention isshown. In this aspect, the tool 10 is illustrated as a drill having ahousing 20 with a first portion 22 and a second portion 24. The first 22and second portions 24 define a cavity for the motor 700, which ispowered by a source of electricity such as a battery or a cordcontaining electricity. The drill has a longitudinal axis that is alongthe motor axis extending generally from the working tip (generallyreferred to as the forward end) toward a rear end. In the particularembodiment shown in FIG. 17, the tool has a torque adjustment sleeve 802disposed between the tool housing 20 and the outer sleeve 780 for thechuck body 764. Rotation of the torque adjusting sleeve 802 will adjustthe torque to a desired level.

A gearbox housing 710 is mounted to a front end 23 of the housing 20.The gearbox housing 710 is mounted using screws that engage bossesprovided on the housing 20 to secure the rear end of the gearbox housing710 to the front of the tool housing. A support plate 750 is fixed atthe rear of the gearbox housing 710 and it contains a central aperture752 through which the motor output shaft 704 passes. The motor outputshaft 704 carries an output gear 706 that engages gearing 712 to drivethe chuck body 764. The gearing 712 includes a first layer of planetgears 714 that can rotate about a first layer ring gear 716. The firstlayer ring gear 716 is rotatably mounted within the gearbox housing 710.The first layer of planet gears 714 are mounted on a carrier 718 throughpins 720 to allow the planet gears 714 to rotate.

The carrier 718 connected to one end 732 of a spindle 730 via anautomatic spindle lock mechanism. The automatic spindle lock may beconstructed in a manner the same as or similar to that described in U.S.Pat. No. 6,702,090, which is incorporated herein by reference.

The second end 734 of the spindle extends toward the chuck body 764 andit has gear teeth 734 that engage planet gears 724 carried by the chuckbody 764 and rotating in a second ring gear 726 that is fixed to thegearbox and torque adjustment mechanism housing 710.

The chuck body 764 in this embodiment is similar to that shown in FIG.16. Accordingly, the chuck body 764 has a front end 766 and a rear end768. The chuck body 764 has an axial forward end with an axial openingthrough which jaws 772 that are capable of gripping the shaft of a worktool extend. The jaws 772 are mounted within bores 774 angularlypositioned through the body 764 and equally spaced throughout the body764. An adjustment ring or nut 778 is mounted within a groove in thebody 764 and it includes threads that engage corresponding threads onthe jaws 772. As a result, when the adjustment ring or nut 778 rotateswith respect to the body 764 the jaws 772 move in a correspondingaxially forward or rearward direction. An outer sleeve 780 is rotatablymounted about the body 764 and is axially fixed with respect to the body764. The outer sleeve 780 is connected to the adjustment ring or nut 778so that when the outer sleeve 780 is rotated, the adjustment ring or nut778 is rotated. A support bearing 788 abuts the rear portion of theledge 776 provided on the chuck body 764.

One or more and desirably three pins 777 extend out from the ledge 776and respectively carry a planet gear 724. The pins 777 may be fixed tothe planet gears, as shown in FIG. 19. A tail 770 extends axiallyrearward from the ledge 776 and it includes an opening 771 in which aportion of the one or more planet gears 724 can extend. Three openings771 are present to receive a portion of the each of the three planetgears 724. As noted above, the three planet gears 724 are driven by thespindle 730 and rotate about the second ring gear 726.

The gearbox and torque adjustment mechanism housing 710 defines a cavity790 into which the jaws 772 may extend.

As noted above, the tool 10 of this aspect has a torque adjustmentsleeve 802 that forms part of the torque adjustment mechanism 800. Theinner surface of the torque adjustment sleeve 802 is formed with threads804 that interengage threads 808 formed on an outer periphery of atorque adjustment ring 806. In addition, the torque adjustment ring 806has at least one rib 807 that engages at least one groove 711 providedon the gearbox and torque adjustment mechanism housing 710 so that thetorque adjustment ring 806 cannot rotate with respect to the gearbox andtorque adjustment mechanism housing 710. Because the torque adjustmentsleeve 802 is axially fixed, rotation of the torque adjustment sleeve802 causes the torque adjustment ring 806 to move in an axial directiondepending on the direction of rotation of the torque adjustment sleeve802. The torque adjustment ring 806 has a boss 810 that engages a firstend 854 of a biasing member 852. The second end 856 of the biasingmember 852 engages a clutch face contact member 858. As illustrated inthe figures, the biasing member 852 is a coil spring and the clutch facecontact member 858 is shown as a pin having a first end 860 engaged withthe second end 856 of the biasing member 852 and a second end 862carrying a ball 864. Alternatively, the second end 862 of the clutchface contact member may have a rounded end (i.e., spherical,semi-spherical, or other suitable face to provide slipping resistance onthe clutch face as will become clear upon review of the descriptionbelow). The second end of the clutch face contact member rides on theclutch face 832. As shown in the figures, three clutch face contactmembers 858 (and associated bosses and biasing members) are provided. Itis believed that by providing three contact members 858, the load oneach biasing member 852 can be reduced and the clutch operation can bemore evenly balanced as compared to the use of only a single contactmember. While three contact members 858 are shown, it is contemplatedthat more or less contact members 858 can be used.

The clutch face 832 is associated with the first layer ring gear 716 anddesirably rotates with the first layer ring gear 716. The clutch face832 may be provided on a face of the first layer ring gear 716. Theclutch face 832 has a configuration to provide resistance to rotation asa result of contact by the clutch face contact member 858. For example,the clutch face 832 may be ramped, may be sinusoidal, or may be providedwith one or more protrusions 834.

In operation, as the outer torque adjustment sleeve 802 is rotated to ahigher torque setting, the torque adjustment ring 806 moves in anaxially rearward direction causing the biasing member 852 to compressand exert a greater force on the clutch contact member 858. As a result,when the first layer ring gear 716 rotates to a point where theprotrusion 834 contacts the clutch face contact member 858, the contactwill provide a resistance to rotation of the first layer ring gear 716.It will be understood that depending on the resistance to rotation ofthe workpiece and depending on the torque setting, the ring gear 716 maystop spinning.

Turning back to FIG. 18 it can be seen that the outer sleeve 780 extendsaxially rearward of the support bearing 786. As a result, a portion ofthe outer sleeve 780 overlies a portion of the gearbox. Advantageously,such an arrangement provides a greater area for the user to grip thechuck sleeve so that it can be rotated for tightening or loosening thejaws.

While the different aspects have been described in connection withcertain features and structures, one of skill in the art will understandthat each of the various features and structures can be used with eachof the embodiments described above even though it is understood thatsome structural changes may be required. The different combinations arecontemplated even though they have not been specifically describedabove.

1. A tool comprising: a. a tool housing containing a motor; b. a spindlehaving a first end and a second end with each end contained within thehousing, the spindle being driven by the motor; c. a chuck body havingan axial forward end, an axial rearward end, a ledge extending radiallyoutward from the chuck body, and a tail extending axially rearward ofthe ledge and driven by the first end of the spindle; d. a plurality ofjaws axially moveable within bores provided in the chuck body; and, e. asupport bearing having an inner periphery fixed to the ledge and havingan outer periphery mounted on a housing, wherein when the jaws are in aback position, a rear portion of the jaws extend axially rearward of thesupport bearing and into a cavity defined within the housing.
 2. Thetool of claim 1 further comprising a nut axially forward of the ledgeand that is axially fixed and rotatable with respect to the chuck bodysuch that rotation of the nut causes the jaws to move axially forward orrearward.
 3. The tool of claim 2 further comprising an outer sleeveaxially fixed with respect to the body and connected to the nut suchthat rotation of the sleeve causes rotation of the nut.
 4. The tool ofclaim 4 wherein the outer sleeve extends axially rearward such that therear portion of the outer sleeve is axially forward of the supportbearing.
 5. The tool of claim 4 wherein the outer sleeve extends axiallyrearward such that the rear portion of the outer sleeve is axiallyrearward of the support bearing.
 6. The tool of claim 1 wherein thehousing forms a portion of a tool housing.
 7. The tool of claim 1wherein the housing forms a portion of gear box housing.
 8. The tool ofclaim 1 further comprising a spindle lock wherein actuation of thespindle lock secures the chuck body from rotation with respect to thehousing.
 9. The tool of claim 8 further comprising a lock gear extendingradially from and fixed to the spindle wherein the lock gear is engagedby the spindle lock.
 10. The tool of claim 1 which is a drill.
 11. Thetool of claim 1 which is a right angle drill.
 12. The tool of claim 1further comprising a torque adjustment mechanism located generallyaxially between the motor and the chuck body to selectively limit atorque from the motor to the chuck body.
 13. The tool of claim 12further comprising a torque override mechanism operable in any settingof the torque adjustment and when actuated does not limit torque fromthe motor to the chuck body.
 14. The tool of claim 1 further comprisinga torque adjustment mechanism located axially rearward of the motor toselectively limit a torque from the motor to the chuck body.
 15. Thetool of claim 1 further comprising pins extending axially rearward fromthe chuck body ledge and carrying planet gears drivingly engaged withthe first end of the spindle.
 16. The tool of claim 15 wherein the outerperiphery of the support bearing is mounted on a gearbox housing suchthat an annular cavity is defined between the tail of the chuck body andthe gearbox housing in which the jaws may protrude in a back position.17. A drill comprising: a. a drill housing having a motor outputdefining a motor output end; b. a gearbox housing containing gearingcoupled to the motor output; c. a chuck assembly having chuck bodyselectively rotated by the gearing and further having an outer sleeveextending axially rearwardly to overlap an axial front portion of thegearbox housing.
 18. A drill comprising: a. a motor driving an outputgear drivingly engaged with a plurality of planet gears rotatable arounda ring gear b. a carrier having pins carrying the planet gears andhaving an output gear to rotatably drive a chuck body having an axialforward end, an axial rearward end, a ledge extending radially outwardfrom the chuck body, and a tail extending axially rearward of the ledgeand driven by the first end of the spindle; c. a plurality of jawsaxially moveable within bores provided in the chuck body; d. a supportbearing having an inner periphery fixed to the ledge and having an outerperiphery mounted on a housing, wherein when the jaws are in a backposition, a rear portion of the jaws extend axially rearward of thesupport bearing and into a cavity defined within a housing; and, e. atorque adjustment mechanism including a torque adjustment ringoperatively engaged with a torque control member that has a portioncontacting a clutch that is operatively associated with the ring gear.19. The drill of claim 19 further comprising a torque bypass mechanismoperable in any setting of the torque adjustment and when actuated doesnot limit torque from the motor to the chuck body.
 20. A toolcomprising: a. a motor with an output gear b. a spindle driven by themotor and having an output end; c. a chuck body having an axial forwardend, an axial rearward end, a plurality of bores in which a respectivejaw is axially moveable, and a ledge from which a plurality of pinsextend in an axially rearward direction; d. an annular formation onwhich a ring gear is mounted; and, e. a planet gear mounted on arespective pin for rotation within the ring gear and drivingly rotatedby the spindle output end, wherein rotation of the spindle causesrotation of the chuck body.